Furnace



arianna: A. alientan, or ronfrnann, onneoit.`

nommen.

Application filed inventer `s, i921. serial no. 513,655.

To all w/lom. imag/concern.'

Be it known that l, ALBERT A. Geiiinma citizen of the United States,residing at Portland, county of Multnomah, State of Oregon, haveinvented certain new and useful improvements in Furnaceaof which thefollowing is a specincation.

My invention relates to furnaces 'in general, and to hot air furnaces inparticular, the object being to provide themost coinplete combustion ofthe fuel and the employment of the greatest possible heat units iii-`the products of combustion.4

l accomplish the above object by means of the construction illustratedin the accompanying drawing, which is a part of'tliis application foretters Patent, like characters of reference indicating. like partsthroughout the several views thereof, and iii, which:

Figfl is a perspective view of a furnace embodying` my invention, partsbeing broken away to illustrate the construction: `Fig. I2

is a sectional plan view'iiponthe line 2-2 of Fig. 1 Fig". 3 is a.sectional elevation upon theA line 3 3 of Fig. 1 is a sectionalelevation ofthe fuel door and draft device thereon: Fig. 5 is aplaiiview of the grate.

The outer `casing 6 of my furnace is of oblong form with substantiallysemicircular ends, the fire box and comluistion chamber being mountedsubstantially in the center of said casing. upper and lower horizontallydisposed plates 7 and 8 respectively, each plate having an oblongorifice therein. Surrounding said orifice in the upper plate 7 is a domestructure 9, closed at the upper end thereof, and within the orifice inthe lower plate 8 is disposed a grate of novel construction.

,it each end of the oblongori'ceviu said limer plate tl is asemicirculai' dished grate member 10, said inen'ibers being jeinedbvside members 1l, the upper edges of each of said dished members and sidentiembers being rolled to form a ledge adapted to contact with the edgeof the orifice in the lower plate S and thus support said grate inem-`beis. Centrally disposed relative to` said side niei'i'ibers 11 are twosolid grate bars 12, each supported at its ends by the adjacent dishedmembers 10, and intermediate each of said solid bars and the adjacentside member 11 is an. open or barred grate member 123 also supported atthe ends thereof upon the adjacent dished members 10.

The fire boi: is composed ofV That portion of each of the plates 7 `and8 lying outside the Adome 9 and grate members 10-'and11 are connected bypipes or tubes 1i, and outside said tubes the plates 7 and 8 areconnected by a vertically disposed plate 15 completely surrounding saidtubes. A spaceis yleft between said plate 15 and the casing 6 entirelysurrounding the fire box except at the front end thereof, at which pointthe plate 15 and casing 6 are brought into contact one with the other,as shown in Figs. 1 and 2.`

Beneath the grate is ythe usual ash receptacle 15 with the ash door 16thereon.

` Closing the upper end of the casing 6 are two plate members 17 and 18joined together `by a tongue and groove construction 19, the

forwardly disposed member 18 having thereon the hot air pipe 2Owherefroin hot air is delivered from the furnace.

A stack, 21`is introduced into the fire box adj acent' its lower plate8, and a pipe 22 also connects the stack with the `dome 9, there .beinga damper 23 in saidpipe.

`The fuel door fof the fire box is of novel construction'adapted tocoact with the above described `novel form of grate to provide` completecombustion. Saidy doorv is composed of an outer member 25 completelyclosing the door aperture in the fire box, and having thereon an airduct entering adjacei'it'tlie top of the door and extending downwardthereon to open adjacent the bottom of the door, as shown at 26, theopening of said duc-t into the `atmosphere being closed by a door 27.Uponthe inner member 28 of said door inclosing the duct 26 is secured aplate 29, there being a small space 30 inteiyening` between saidplate 29and said member 28.

When the lire is lighted in the furnace, that jiioition of the fuelabove the barred grate members 13 will burn rapidly because of the draftcoming up through the grate inembers 13, while that portion of the fuelupon the solid grate members 12 will burn very slowly, gases beingliberated from said latter fuel portion by means of the heat generatedby the rapidly burning fuel portion. As the gases liberated from thecentrally disposed portion of fuel rise oxygen for their combustion isfurnished by the draft of air entering the duct 26. rllhe plate 29becomes highlyheated, and as the air enters the fire box from duct 26 itimpinges upon the lower end of said plate, and is thereby heated, theresult being that a portion of said air is directed upward through thespace 3Q, and emerging from the top thereof is directed upon theproducts of combustion` within the top of the fire box, therebyproviding oxygen therefor and resultant complete combustion.

The greater portion of the products of combustion ascend into the dome 9impart ing,` a large portion of their heat thereto, and being therebycooled they descend along the walls of said vdome back into the firelbox and thence outward between the tubes 1 4 into the space betweensaid tubes and the fire box plate l5, imparting more of their heat tothe tubes 14; when passing therebetween and to the plate l5 asthey/"i-mpinge thereupon. By the time thecooli-ng products of combustionhave descended sufficiently to reach the stack 21 they have parted withthe major portion of their heat to the dome, tubes and re boX plate.

The air to be heated enters the furnace casing G at 3l and passes upwardto the delivery pipe 20, some by way of the space between said casing'6` and the plate 15, `and some through the tubes le, being thus highlyheated upon reaching the pipe 20.

The pipe 22 and damper 23 are used when starting' the fire to provide adirect passage for the products of combustion before the furnace isthoroughly heated. 4

By this construction I obtain three essential features: First very largeheatingl surface due to the platell, tubes ltalnd dome 9: second verycomplete combustion due to the `novel construction of the grate and firebox door: Third effective exhaustion of the heat units within theproducts of combustion by having the stack remove the sainefromsubstantially the leve-l of the re box floor.

My device may be made of any size, and constructed of any'materialsdeemed con venient andsuitable for a device of this chaiacter, and whileI have illustrated and described a form of construction and arrangementof parts found desirable in materializing my invention, I wish toinclude in this application all mechanical equivalents and substitutesthat may fairly be considered to come within the-scope and purview of myinvention as defined in the appended claim.

Having disclosed myv invention so that others may be enabled toconstruct and to use the same, what I claim as new, and desire to secureby Letters Patent is:

In a furnace fire box: horizontally disposed plates connected by avertical peripherally disposed plate; a plurality of air tubesconnecting said horizontal plates adacent said vertical plate; a singledome rising from the upper of said verticalplates within the spaceoccupied by said tubes said dome 'being closed at the top thereof;dished grate members supported by the lower of said horizontal plates;solid grate members centrally disposed upon ysaid dished meinbers;barred grate members disposed upon each side of said solid gratemembers; a stack leading from said lire box substantially at the levelof the lower of said horizontal plates; and a door having two verticallydis- ALBERT A. GABRIEL.

lIitnesses C. F. BLAKE, Lnvi J. RoniNsoN.

